Migraine is the most weather-related health complaint that exists. Stress is the most common cause of headache and migraine. The weather however can aggravate the symptoms. Decreasing atmospheric pressure, extreme heat, extreme cold, high humidity, a strong increase in wind, thunderstorms and bright sunshine can further exacerbate symptoms. The migraine weather forecast gives an indication of how, as a result of the weather, symptoms will be milder or more severe.